Independent rotation for percussive tools



Jam-.15 1924.

A C. C. HANSEN INDEPENDENT RoTATIoN. FOR PERcUssIvE TooLs Original Filed April 7. 1922 INVENTOR Cyaan/e s @Hans @n Patented Jan. 15, 1924.

. UNITED STATEs l `1,480,552 PATENT? oFFglfcs.

CHARLES c. HANSEN, or EssToN, rENNsYLvANIA, AssIGNon '1:0 INeEssoLL-EAND COMPANY, or JERSEY CITY, NEW JERSEY, A, CoEroEsrloN QE .NEWJEEsEn INDEPENDENT Ro'rn'rioN F013I .PEBCUSSIVE TOOLS.

Original application led April 7, 1922, Serial No. ,550,421. DividedA and this application filedA March 5,

1923. Serial Y To all 'whom t may concern Be it known thatl, CHARLES C. HANSEN', a citizen of the United States, and a resident of Easton, county of' Northampton, and State of Pennsylvania, have invented a certain Independent Rotation for yPercussive Tools, of which the following-eis ya specifica'- tion, accompanied by drawings. ,v

This invention, which is a divi'sionofgrnyf copending application, Serial No. 550,421, filed April 7, 19.22, relates to fluid actuated percussive tools, such as rock drills, which may be of the hammer type but relates more particularly to means independent of the piston for imparting rotation to the drill steel. 4

The objects of the present inventionV are to simplify and reduceY the cost of Construction of they rotation motor, enable the motor to be conveniently nio-iuited at the side of the back end of the cylinder', and produce. a construction by means` oct' which` the motor and its operative driving connections may be readily assembled and disassembled in the machine.

Further obj ects of the .invention will here: inafter appear and the. invention is shownin one of its vpreferred ormsin the accompanying drawings, in whiclnp Figure 1 is a side elevation partly broken away and partly in longitudinal section of so much of a. rock` drill as will serve to illus-trate the invention;

Figure 2 is a horizontal sectional plan view on the line 2-2 of Figure 1, and

Figure .3 is a detail transverse sectional view of the motor on the line 3 3 of Figure 2 looking in the direction of thel arrows.

Referring to the drawings, the cylindeITA. is provided with a fluid actuated recPrQCat` ing hammer piston B ot' any suitable type, and the drill steel C extends. into. the front head D in position to receive the impact blows of the piston.l Motivey fluid for operating the piston is supplied to the machine at the inlet E controlled. by the throttle valve F in thebaok head G and the cylinder A, front head D and back head Gn are held together by the usual side bolts.

otation is i1np arte l to the drill steel C by means of a rotation motor, in this .inf stance shown as a rotary gear motor, having the gears J and K. suitably. mounted in a motor casing L, which is adapted to. be

removably mounted at the side of. the rearward end 'of the cylinder A and one of the gears, as. the gear K is operatively connected to rotate the drill steel through drivingfconf nections constructed in accordance with my invention. E l i AS Shown, the cylinder isv formed witha reduced extension O and a projection form;

ing a shoulder P at the. rearward end'ofV the.

cylinder, located forwardly ofthe. back end' tension O, and preferably does.not .bear i upon .the cylinder extension, butja space S, is left betweenthe bottom of the motor' cas.- ingy andthe cylinder extension, which per. mitstlie motor to exhaust. through the eX?. haust openings T into the space Sv beneath the mot-or, and from `thence, to atmosphere. throughthe space'or passage S, betweeny thel backhead G and the motor casing. Fluid pressure is supplied to the motorl casing.

through tlieadmission port U from a. port. V in the back head G communicating with the valve F.. v V

The construction described avoids the'ne cessity ci machining the surface of the cylinder extension O beneath the motor, and re` quires only that the plane surface or faceof the cylinder projection P be machinedv to form a tight; fit with the Lmotor casing.. The motor casing is readily secureda'and ycentered upon the cylinder projection as. by means of longitudinal bolts W passing through the motor casing and the cylinderv projection, and byl this. means the bolts. are better able to resist longitudinal strains.

The cylinder back headv Gr iS.- suitably centered over. the back end of the cylinder ex. tension O in any suitable manner, in this in'- stancel the back` head G being; provided withvv the Hangs X., only a portion of which is shown for illustrative purposes. The. back.

supply controlled by the` throttle` tion of the driving shaft, as by means of a key c. The gear J rotates on roller bearings al on the stationary shaft c having hearings inthe-motor casing, and cylinder'projection respectively. The driving` shaft is preferably formed in rearward and forward seetions I) and f suitably coupled together as bymeans of the undercut and overlapping vportions g and it, and a loose sleeve y is placed over the shaft and entends over the coupling members within the .chamber 7c, in the. cylinder A through which thefshafts extends. The rearward shaft section Z) rotates in a roller bearing in the back head R of the motor casing, and in a roller bearing p carried in the bushing g in the body portion of the cylinder. .The forwardr shaft section f rotates in the roller bearing r carried in the bushing s at the forward end of thecylinder body. Slight clearance is provided between'the ends `of the shaft sleeve j and the roller bearing bushings g and s so that when the motor casing and motor gears Lare removed from the machine,'thus separating the shaft section from the. shaftvsection 7', but 'leaving theroller bearingy? in position, the shaft sleeve =j may be utilized to push the roller bearing p from the bushing g. Obviously, after the front head D of the machine has been removed, andthe parts connected therewith, including the roller bearing r, a tool may be inserted against the shaft sleeve j to push the sleeve longitudinally.

Suitable gear connections are provided for transmitting rotation from the driving shaft of the motor to the drill steel, and for this purpose the shaft section f is provided with a pinion t meshing with' a gear a having a pinion 'v meshing with a gear w, which is suitably secured as by means of screw threads fr to the chuck yfor rotating the chuck. A chuck sleeve .e is preferably inserted within the back end of the chuck, and the chuck bushing 2 is inserted in the chuck against the chuck sleeve a. The chuck g/ is suitably clutched to the chuck key 3 and `ro tation is imparted to the drill steel through the agency of the usual lugs 1l: on the shank of the steel, which engage the chuck y. l/Vithin the front end of the cylinder is preferably located the front cylinder bushing 5 through which the forward extension 6 of the piston B reciprocates, and'in order to provide air for blowingl down through the drill steel the of the cylinder and operative ly' connectedto i rotate the drill steel.l said motor h ving a casing, a back head forrsaid motor casing,g rotary gears mounted in said motor casing, a sectional driving shaft having lfor-- ward and rearward sections slidably coupled together, the rearward section being keyed to one of `the gears, and having'antiv friction bearings in the said back head andi inthe body portion of the cylinder. the forward shaft section having an anti-friction bearing at the forward end of thek cylinder body, and a loose'shaft slee-ve over said shaft coupling, whereby the motor may be dismounted without removing the entire driving connections,

2. In a fluid actuatedI percussivetool, the

combination of a cylinder and reciprocating. piston and a fluid pressure rotation motor mounted. at the side of the rearward end `of the cylinder and operatively connectedfto rotate the drill? steel, said motor having `a casing open at,.the front end and yadapted to be removably secured'against a plane face of the cylinder, a back'head for said motor casing, rotary` gears mounted in said motor casing, a sectional driving shaft hav-V inn ing `forward and rearward ysections slidablyV coupled together, the. rearward section being keyed to one of the gears and'having antifriction bearings, in the said back head and inthe body portion of the cylinder, the forward shaft section l`having an anti-fric` tion hearing at the forward Vend of the cylinder body, and a looseshaft sleeve over said shaft couplinggvwhereby the motor be dismounted without removingthe 'entire driving connections. l v

3. In a. fluid actuated percussivetool, the combination of a cylinder and reciprocating piston and a fluid pressure rotation motor mounted at the side of the rearward end of the cylinder and operatively connected fto' rotate the Idrill steel, said motor having` a casing, a back head for said motor casing, rotary gears mounted in said motorcasing,

a sectional driving shaftv having forward i and rearward sections slidably coupled `together, the rearward section being keyed to one of the gears, an anti-friction bearing for said rearward shaft section in the said back head, a bearing bushing and anti-fric ton bearing therein for the rearward shaftsection in the body portion of the cylinder, a bearing bushing and anti-friction bear- I ing therein for the forward shaft section at the forward end of the cylinder body, and a loose shaft sleeve over said shaft coupling, whereby the motor may be dismounted without removing the entire d riving connections. f

4. In a fluid actuated percussive tool,=the combination of a cylinder and reciprocating piston and a fluid pressure rotation motor mounted at the side of the rearward end of the cylinder and operatively connected to rotate the drill steel, said motor having a casing,'a back head for said motor casing, rotary gears mounted in said motor casing, a sectional driving shaft having forward and rearward sections slidably coupled together, the rearward section being keyed to one of the gears,an anti-friction bearing for said rearward shaft section in the said back head, a bearing bushing and anti-fric tion bearing therein for the rear shaft section in the body portion of the cylinder, a bearing bushing and anti-friction bearing therein for the forward shaft section at the forward end of the cylinder body, and a loose shaft sleeve over said shaft coupling having appreciable clearance between the ends of the sleeve and the said bearing bushings, whereby the sleeve may be moved relatively to the bushings for disassembling the bearings.

In testimony whereof I have signed this specification.

CHARLES C. HANSEN. 

